Hayate and Nagi are excited about him being qualified for Hakuou Academy. Nagi decides to have a party to celebrate this. However, Yukiji has not told Hayate that he actually failed because she felt guilty for playing pranks on him before the test, resulting in Hayate's nervousness. Yukiji gets help from her sister, Hinagiku. After beating up her sister, Hinagiku tells Yukiji to take responsibility as an adult. The two then go to Sanzen'in's mansion to find a really big society party...